What is HHO EFIE for O2 sensor and why it is needed?

So, you got an HHO generator Producing hho gas, but results aren’t good as expected?
EFIE is exactly what you need.

EFIE - stands for Electronic Fuel Injection Enhancer.

But why HHO system needs EFIE to operate properly?

Everyone who want to save fuel and increase his MPG using HHO system need to know
this: Car computer (ECU) ruins fuel saving by injecting more fuel than necessary
when using HHO. Luckily solution is found:

air/fuel ratio of 14.7/1. oxygen sensor is used to read the oxygen value

in the exhaust. Because our engine works in cycles the oxygen reading

is constantly changing between 0.1 to 1 Volt.

The ECU works hard to maintain a constant average of oxygen: if average value too
low (too little oxygen), the ECU cut’s down on fuel supply. If the average value
is too high, the ECU orders more fuel to be injected. Be aware: bad/old oxygen sensor
wont let you to gain high MPG, If you sensor is older than 40000 miles replace it
at once.

So what is EFIE anyway: Now, when you add a hydrogen gas saver to your car, HHO gas
is added to the intake air of the engine. As a result the engine works more efficiently,
burning more percentage of the fuel / hho mix and draws more oxygen from outside.
One effect of increased efficiency is more oxygen emitted then the sensor “expect”

The problem: the ECU “senses” more oxygen than usual and orders more fuel to be injected
to compensate. This action ruins any gas economy gained thanks to hydrogen gas saver.

The solution: EFIE - an electronic circuit used to covert oxygen readings from the
sensor to lower values preventing unnecessary rich mixture injection.

The EFIE contains a On/Off switch, when On means the device is working and adjusting
the air/fuel ratio to value of our choice, where Off means the car is running at
the original air/fuel ratio. This means that when taking out the hydrogen device
for maintenance you just need to set the switch to off position and return to “normal”
injection mode without messing with wires or anything else. Possible to build yourself
-EFIE schematics included.

(What’s today considered “normal” is in fact “the modern art of inefficient fuel
burning” :)

If your car have two O2 sensors on the exhaust pipe, between the engine and the catalytic
converter, you need to connect both of them to EFIE. In this case special EFIE required
called Double EFIE. Alternatively, you can use two “regular” EFIEs, one per each
sensor (this is not a straight forward option because each EFIE need to be adjusted
separately).

Such commercial Device might look like this:

(Electric box with connections to each sensor)

What EFIE is the right one for my car?

Car’s oxygen sensor type - wide or narrow band:

The most important factor is the type of the oxygen sensor. There are two possible
types: Wide band oxygen sensor and Narrow band oxygen sensor.

In addition, there are two possible sensor locations :

1) Front sensors - Between the engine and the catalytic converter, Important and
used for ECU calculations. Could be one or more.

2) Back sensors - After the catalytic converter. Narrow band in most cases.

General simple rules:

First of all locate the sensors in your car, use guide if necessary. If The sensor
got 5 or more wires - it is a wide band sensor.

If your car is 1997 or older model than it is narrow band.

If your car is US made than it is narrow band.

But the most effective way is to Google: [car] [model] oxygen sensor band.